Finding the Fourth Proportional to 111.56, 153.87 and 83.93

Step by Step Solution

1. Step 1: Write the proportion equation
   111.56 : 153.87 = 83.93 : x
2. Step 2: Convert to fraction form
   111.56/153.87 = 83.93/x
3. Step 3: Cross multiply
   111.56x = 153.87 × 83.93
4. Step 4: Simplify right side
   111.56x = 12,914.31
5. Step 5: Solve for x
   x = 12,914.31/111.56
6. Step 6: Final answer
   x = 115.76